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Cow / calf preweaning efficiency of Nellore and Bos taurus x Bos imdicus
| Content Provider | Semantic Scholar |
|---|---|
| Author | Calegare Alencar Packer, Irineu Umberto Ferrell, Calvin L. Lanna |
| Abstract | The objectives of this study were to ileterruine if percentage Bos taurus (0 or 50%) of the cow had an effect on ME requirements and milk production. and to compare cow/calf efficienc y among 3 mating systems. Metabolizable energy requirements were estimated during a feeding trial that encompassed a gestation and lactation feeding trial for each of 2 groups of cows. Cows were 0 or 50% Bos taurus (100 or 50(Yc. Nellore) breed type: Nellore cows (NL; n = 10) mated to Nellore bulls, NL cows (ri = 9) mated to Angus bulls, Angus x Nellore (ANL; n = 10) and Siiriinental x '\( , Ilore (SNL; ii = 10) cows mated to Canchini (5/8 Cliarolais 3/8 Zebu) bulls. Cows were individually fed a total mixed diet that contained 11.3% CP and 2.23 Meal of ME/kg of DM. At 14-d intervals, cows and calves were weighed and the amount of DM was adjusted to keep shrunk BW and BCS of cows constant. Beginning at 38 d of age, corn silage was available to calves ad libitum. Milk production at 42, 98. 126, and 180 d postpartum was measured using the weigh-suckle-weigh technique. At 190 d of age, calves were slaughtered and body composition estimated using 9-10-11th-rib section to ohtam energy deposition. Regression of B\V change on daily ME intake (MET) was used to estimate MEl at zero BW change. Increase in percentage Dos taurus had a significant effect on dail y ME requirements (Mcal/d) during pregnancy (P < 0.01) and lactation (P < 0.01). Percentage Bos taurus had a positive linear effect on maintenance requirements of pregnant (P = 0.07) and lactating (P < 0.01) cows; during pregnancy, the ME requirements were 91 and 86% of those in lactation (131 + 3.5 vs. 145 -L 3.4 Mcalkg°' . d') for the 0 and 50% B. taurus groups. respectively. The 50% B. tauVUS cows, ANL and SNL, suckling crossbred calves had greater total MET (4,319 ± 61 Meal: P < 0.01) than 0% B. taurus cows suckling NL (3,484 + 86 Meal) or ANL calves (3,600 + 91 Meal). The 05'c, B. taurus cows suckling ANL calves were more efficient (45.3 ± 1.6 g/Mcal; P = 0.03) than straightbreci NL (35.1 + 1.5 g/Mcal) and ANL or SNL pairs (41.0 ± 1.0 g/Mcal). Under the conditions of this study. crossbreeding unproved cow/ call efficiency and showed an advantage for cows that have lower energy reqiureinents. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://naldc.nal.usda.gov/download/28170/PDF |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
